Nature and development of plants . Fig. 172. Diagram of a section of one of the puffballs, showing thethick skin or periderm and the irregular cavities which are lined withbasidia. At the base the larger, sterile cavities of the stipe are shown. periderm splits into rather regular star-like segments or valveswhich are hygroscopic. In damp weather these valves roll back,in some species to such an extent as to lift the puff ball from the. Fig. 173. One of the puff-balls popularly known as earth stars, show-ing the outer periderm splitting into star-like sections and the inner peri-derm opening b
Nature and development of plants . Fig. 172. Diagram of a section of one of the puffballs, showing thethick skin or periderm and the irregular cavities which are lined withbasidia. At the base the larger, sterile cavities of the stipe are shown. periderm splits into rather regular star-like segments or valveswhich are hygroscopic. In damp weather these valves roll back,in some species to such an extent as to lift the puff ball from the. Fig. 173. One of the puff-balls popularly known as earth stars, show-ing the outer periderm splitting into star-like sections and the inner peri-derm opening by a pore. ground, when it may be set rolling by the wind and thus bringabout a better discharge of the spores. 98. Order e. Nidulariales or Birds Nest Fungi.—These mi-nute and curious fungi may be found growing upon twigs orupon bare ground in old fields, or upon dried dung (Fig. 174, A).They differ chiefly from the puff balls in that the spore-bearingcavities are surrounded by tougher hyphae. Consequently, when 236 FORMS OF GASTEROMYCETES the periderm of these little cup-shaped bodies open, these tougherparts appear as minute eggs in a nest (Fig. 174, B). 99. Order f. Phallales or Stink Horns.—These fungi first
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